Note that an answer with 0 digits must be accepted, as it has always been like:
https://www.codechef.com/viewsolution/17333079
where in the question the sample answers had decimal digits, but my solution which printed integer only was accepted.

The reason of no response was that we can do nothing after the contest gets over and things are done. Its a common problem with rookie setters, and its hard to do something about it. He probably selected the wrong judge (i.e. check if given output is an exact match instead of check if error is less than ${10}^{-6}$.)

Also, please tend to mail such issues either to me or @admin (preferably). At times a few things get missed at forum due to busy schedule- especially as there are urgent matters coming up at mail.